敏化处理对00Cr21NiMn5Mo2N节镍型双相不锈钢堆焊层耐腐蚀性能的影响

doi:10.11902/1005.4537.2021.289

中国腐蚀与防护学报

2022, Vol. 42

Issue (6): 1027-1033 DOI: 10.11902/1005.4537.2021.289

研究报告

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敏化处理对00Cr21NiMn5Mo2N节镍型双相不锈钢堆焊层耐腐蚀性能的影响

包晔峰(

), 武竹雨, 陈哲, 郭林坡, 王子睿, 曹冲, 宋亓宁

河海大学机电工程学院常州 213022

Effect of Sensitization Treatment on Electrochemical Corrosion and Pitting Corrosion of 00Cr21NiMn5Mo2N Stainless Steel

BAO Yefeng(

), WU Zhuyu, CHEN Zhe, GUO Linpo, WANG Zirui, CAO Chong, SONG Qining

College of Mechanical and Electrical Engineering,Hohai University, Changzhou 213022, China

引用本文:

包晔峰, 武竹雨, 陈哲, 郭林坡, 王子睿, 曹冲, 宋亓宁. 敏化处理对00Cr21NiMn5Mo2N节镍型双相不锈钢堆焊层耐腐蚀性能的影响[J]. 中国腐蚀与防护学报, 2022, 42(6): 1027-1033.
Yefeng BAO, Zhuyu WU, Zhe CHEN, Linpo GUO, Zirui WANG, Chong CAO, Qining SONG. Effect of Sensitization Treatment on Electrochemical Corrosion and Pitting Corrosion of 00Cr21NiMn5Mo2N Stainless Steel[J]. Journal of Chinese Society for Corrosion and protection, 2022, 42(6): 1027-1033.

全文: PDF(7606 KB) HTML

摘要:

采用TIG焊粉末堆焊技术在Q235基体上制备了00Cr21NiMn5Mo2N双相不锈钢堆焊层。在1170 ℃对堆焊层试样进行固溶处理,之后在800 ℃分别敏化处理0.5、1、2和4 h,探究经不同时长的敏化处理后材料的组织和性能变化。显微组织观察表明,固溶处理后堆焊层组织由奥氏体 (γ) 和铁素体 (α) 两相组成。敏化处理后析出相沿相界析出,且含量随着敏化时间的延长逐渐增多。点蚀浸泡实验、动电位极化曲线测试、电化学阻抗谱测量表明,试样的耐腐蚀性能在敏化时间从0.5 h到2 h时下降；然而,敏化4 h的样品的耐腐蚀性显著提高,甚至超过固溶处理后的耐腐蚀性能。

关键词 ： TIG粉末堆焊, 双相不锈钢, 敏化处理, 析出相, 点蚀

Abstract：

In order to study the effect of the precipitated phase on the corrosion resistance of duplex stainless steel, surfacing layers of 00Cr21NiMn5Mo2N duplex stainless steel were prepared on Q235 via tungsten inert gas (TIG) powder surfacing. The surfacing layered samples were solid-solution treated at 1170 ℃, then sensitized at 800 ℃ for 0.5, 1, 2 and 4 h respectively, and then the effect of sensitization time on the microstructure and corrosion resistance of the surfacing layer was assessed. The results showed that the microstructures of the duplex stainless steel surface layers after solution treatment were mainly composed of ferrite phase and austenite phase. After sensitization, the precipitated phase dispersed along phase boundaries, while the content of the precipitated phase gradually increased with the sensitization time. The corrosion resistance of the samples decreased when the sensitization time increased from 0.5 h to 2 h. However, the corrosion resistance of the samples sensitized for 4 h increased significantly. The pitting potential of the sample sensitized for 4 h was 668 mV higher than that of the sample sensitized for 2 h. In addition, the morphology of samples after pitting also reflected the change of pitting resistance of the samples.

Key words： TIG powder surfacing duplex stainless steel sensitization treatment precipitation phase pitting corrosion

收稿日期: 2021-10-18

ZTFLH:

TG174

基金资助:国家自然科学基金(51879089)

作者简介: 包晔峰,男,1966年生,教授,博士

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https://www.jcscp.org/CN/10.11902/1005.4537.2021.289 或 https://www.jcscp.org/CN/Y2022/V42/I6/1027

图1 固溶处理态及经不同时长敏化处理堆焊层试样的显微组织

图2 固溶处理态及敏化处理4 h试样的XRD谱图

图3 固溶处理和敏化处理堆焊层试样极化曲线

图4 固溶处理及敏化处理试样电化学阻抗谱图及拟合电路

表1 电化学阻抗谱拟合数据

图5 敏化处理不同时长试样点蚀后的显微组织

图6 试样经点蚀浸泡后组织中点蚀坑平均数量

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